Warp stop motion



A. E. HHOADES. WARP STOP MOTION.

APPLICATION FILED MAY 11. 1921.

1,4193077. PatentedJune .6, 192,2.

ALONZOE. RHOADES, 0F HOPEDALE, MASSACHUSETTS, ASSIGNOR TO DRAPER CORPO- RATION, 0F HO-PEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

WARP STGP MOTION.

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Specification of Letters Patent.

Patented June 6, 1%22.

Application filed May 11, 1921. Serial No. 468,533.

To all whom it may concern:

Be it known that I, ALoNzo E. RHoADns, a citizen of the United States, residing at Hopedale, in the county of l/Vorcester and State of Massachusetts, have invented an Improvement in WVarp Stop Motions, of which the following description, in connection with the accompanying drawings, is a specification, like characterson the drawings representing like parts.

This invention relates to warp stop motions for looms wherein a series of drop wires are normally supported by the warp thread during weaving, and when a warp thread becomes broken or too slack for weaving purposes, the associated drop wire drops into position to act through a train of mechanism to effect loom stoppage.

In that type of warp stop motion wherein the detector passes through openings in a row or bank of drop wires, the arrest of the detecting movement of the detector by a drop wire is utilized to stop the loom. In such cases, however, defective action of the warp stop motion is liable to occur by reason of'the accumulation of lint on the detector, so that when a drop wire is dropped by a broken or abnormal slack warp thread, the lint will. preclude the interengagement of the detector with the narrow slot or opening in the dropwire, and the loom will continue to run under such conditions and produce imperfect cloth.

The object of the present invention is to overcome this defective action in the warp stop motion of the type indicated, and to insure effective engagement vof the. detector and a drop wire, so that when a warp thread breaks or becomes too slack for weaving purposes, the dropped wire in cooperation with the detector will unerringly effect loom stopp important feature of the present invention, therefore, consists of a detector which partakes of its detecting movement in the widened portion of the opening in the drop wires when the latter are held raised by normal warp threads, and in which the construction of the detector and the upper portion; of the opening in the, drop wires is such that effective operation of the stop mechanism will be effected when a drop Other novel features of construction and combination of parts in addition to the above will hereinafter be described in connection with the accompanying drawing, which shows a good practical form of the present invention.

In the drawings Fig. 1 is an enlarged or exaggerated sec tional View through the detector showing the drop wire in side elevation, and held raised by an intact or normal warp thread;

Figs. 2 and 3 are views similar to that of Fig. 1, showing the detector and its oscillating movement in the widened portions of the openings of the drop wires when the latter are held raised by normal warp threads;

Fig. 4: is a View similar to that of Fig. 1, but with the drop wire dropped by a broken warp thread, and showing the engagement of the detector and the upper slotted portion of the dropped wire;

Fig.6 is a perspective view showing a series of drop wires held raised by normal warp threads, and the detector passing through the engaged openings of the drop wires.

The drop wires 1, except as hereinafter more fully explained, may be of usual construction. As shown, each of the drop wires has the lower portion thereof formed of legs 2, and through the opening therebe tween passes the controlling warp thread 3.

The drop wires, as indicated in Fig.5, are

arranged in one or more rows, and the warp threads 3 pass over the warp supports t at opposite sides of the drop wires, and, in the present instance, the warp threads pass through the opening between the legs 2 of the drop wires. The above described con struction may, however, be of any usual type, the essential being that the drop wires may be held raised by normal warp threads.

Each of the drop wires is. provided with an opening, which, in the present instance, is shown in the upper portion of the drop wires at 5. Through the openings 5 in the drop wires the detector 6 passes, and the size or width of the openings 5 is such that when the drop wires are held raised by in tact warp threads, the detector may partake of its detecting movement without restraint by any of the drop wires. In the present instance, the detector 6 is connected with a vibrating arm 7, and is given an oscillatory movement through a train of mechanism,

many forms of which are well known in the art. Since the details of the mechanism which is connected to the arm 7 liorms no part of the present invention, and are well understood by those skilled in the art, illustration and description of such mechanism is not deemed necessary to enable those ta miliar with warp stop motions to construct and operate the invention.

The detector 6 is formed of abar non-circular in cross section which extends from side to side of the loom, as indicated in Fig. 5, and when all of the drop wires are held raised by normal warp threads, the detector or bar 6 will be oscillated in the widened portion of the opening in the drop wires. Should a warp thread break or become too slack, the associated drop wire will drop under its own weight, and in this general type of warp stop motion, the detector at such times is engaged by a narrow slot in the upper portion of the drop wire, and according to the purpose of this type of warp stop motion, the detector will be arrested in its oscillating movement and effect loom stoppage.

During weaving, lint is liable to accumulate on the detector, and in such case the lint is liable to prevent effective engagement of the detector with the narrowed slot or opening in the top portion of the drop wire.

In the present invention, however, the detector and the narrowed opening or slot in the drop wires are so constructed that even should lint accumulate upon the detector, during weaving, it will not interfere with the effective engagement of the detector and the narrowed slot or opening in the drop wire when a warp thread breaks or becomes too slack.

The detector 6 has its side walls 8 nonparallel. These side walls converge upwardly, so that a cross section of the detector is substantially wedge-shaped, as clearly indicated in the drawings.

The drop wires are each provided with a narrow opening or slot 9, the side walls 10 of which preferably converge upwardly as shown. The entrance to the narrowed slot 9 in a detector is widened, as indicated at 11, and the side walls of the narrowed opening curve inwardly without an abrupt change in direction, and converge upwardly up to the end wall 12.

The side walls 10 of the narrowed opening in the detectors may advantageously converge upwardly at the same angle as the converging side walls 8 of the detector, but the slot 9 is sufliciently deep and narrowed near the end wall 12, that the wall 12 does not rest upon the detector when the drop wire is released by a warp thread, but, on the con trary, a space is provided between the. end wall 12 and the top of the detector when the drop wire is lowered to its stopping position, in which the accumulated lint on the detector may [be accommodated. The construction is such that when a drop wire is released by its controlling warp thread, it will drop, and the wedgedike detector will be engaged by the wedge-like opening at the upper end of the drop wire, and owing to the converging character of the walls of the detector and opening 9 of the drop wires, the interengagement of the detector and narrowed opening in a drop wire will be made eiiective' to arrest the detecting movement of the detector, even though lint may have accumulated on the detector.

From Fig. 4t it will be noted that the width of the narrowed opening 9 in the drop wire adjacent the end 12 is made less than the width of the detector, so that when a drop wire is released by a warp thread, the side wallslO of the opening 9 engage the side walls of the detector, and the drop wire is supported thereby, with the end wall 12 of the opening 9 some distance above the top of the detector, consequently, a space is provided between the top of the detector and the wall 12 of the opening in the drop wire for the accommodation of any lint that may have accumulated on the detector. The consequence is that even though lint be accumulated on the top of the detector, the drop wire will functionally engage the detector and an rest its movement when released by a warp thread.

In the present instance of the invention, it should be noted that the narrowed openings 9 in the drop wires and the widened openings are located above the warp threads, and such disposition of the openings and warp threads is advantageous for some purposes. With certain classes of goods it may be desirable to position the detector and the openings 5 and 9 of the drop wires below the sheet of warp threads, but in either case the essential is that the character of the detector and the narrowed slot or opening in the drop wires be such that regardless of the accumulation of lint upon the detector, effective engagement may be had between the detector and a drop wire when the latter fails to be supported by a warp thread. This characteristic of the present invention, is of importance because the drop wires 1 are necessarily very light, in order to prevent injury to the warp threads which support them.

What is claimed is 1. 1n a warp stop motion for looms, the combination of a detector of non-circular cross-section, a plurality of drop wires each having a wide opening through which the detector passes and in which it has a detecting movement when the drop wires are supported by normally conditioned warp threads, and each havinga detector arresting opening wlth converging side walls the upper portion of which arresting opening is narrower than the width of the upperportion of the detector to form a lint receiving space between the top of the detector and the upper end of the opening when a drop wire fails to be supported by a warp thread.

2. In a warp stop motion for looms, the combination of a detector having upwardly converging side walls, drop wires each of which has a wide opening in which the detector has a detecting movement, and an upper narrow opening the side walls of which converge upwardly to conform to the inclination of the converging walls of the detector that the converging walls of the drop wire may move into wedging engagement with the walls of the detector to arrest the detector when a drop wire fails to be supported by a warp thread, the narrow opening being extended upwardly beyond the point to which the detector enters therein thereby to provide a lint receiving space between the end wall of the narrow opening and the top of the detector.

3. In a warp stop motion for looms, the combination of a detector of noncircular cross-section, a plurality of drop wires each having a wide opening through which the detector passes and in which it has a detecting movement when the drop wires are supported by normally conditioned warp threads, a warp thread receiving opening below and spaced from the detector receiving opening, and a detector arresting opening extending upwardly from the detector receiving opening and having a width sufficiently narrow to engage the side walls of the detector when a wire drops to thereby arrest the downward movement of the wire before the detector contacts with the upper end of the opening, whereby a lint receiving space is formed between the top of a detector and the upper end of the opening.

4. In a warp stop motion for looms, the combination of a detector having a narrow upper and a wider lower surface, a plurality of drop wires each of which has a wide opening through which the detector passes and in which it has a detecting movement when the drop wires are held raised by the warp threads, and a narrower opening having inclined walls that are a less distance apart near their upper end than the width of the detector, that a drop wire may be supported on the detector by engagement with the sides thereof, thereby leaving a lint space between the end of the narrow slot and the top of the detector.

5. In a warp stop motion for looms, the combination of a detector of non-circular cross-section, a plurality of drop wires each having a wide opening through which the detector passes and in which it has a detecting movement when the drop wires are supported by normally conditioned warp threads, and a detector arresting opening extending upwardly from the wide opening and having its side walls positioned to receive and firmly engage the side walls of the detector when a wire drops, thereby to arrest the downward movement of the wire with the upper end of the opening spaced from and providing a lint receiving space between it and the top of the detector.

In testimony whereof, I have signed my name to this specification.

ALONZO E. RHOADES. 

